A good example is an application that processes content, such as a document archiver where you want to build indexes and other information from the content.
The area contains information about the document, such as ownership, copyright, and keywords; and the area contains the content of the document to be displayed.
区域包含关于文档的信息，如所有权、版权和关键字；而 区域包含要显示的文档内容。
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Document definitions can inherit information from other document definitions allowing you to define a complex mapping of XML content to RDF metadata information.